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Lithium battery charge and discharge methods to extend battery life Views [0] Published: 2018-03-14 10:50:53

In recent years, the market share of lithium batteries has increased rapidly and lithium batteries have developed rapidly. According to relevant data, the lithium-ion battery market is expected to reach 450 billion yuan in 2020. Then, with more and more people using lithium batteries, there will be some concerns and hidden dangers. At present, lithium-ion battery technology is relatively mature, the correct use of lithium batteries, lithium battery charge and discharge, both to ensure the battery life, but also to avoid security risks.

For the lithium battery how to charge, we know that lithium battery charger needs to use the matching charger, in the industrial supporting market, because each product is also individually packaged, not common, therefore, should choose the appropriate charger according to the used lithium battery pack, Strictly in accordance with the requirements of charging. Regardless of the industrial or civilian market, the basic principle of how to charge a lithium battery is the same. Therefore, the steps and standards for charging a lithium battery can be standardized. Under normal circumstances, the nominal voltage of a lithium battery is 3.7V. It is 4.2V. If the nominal voltage of the lithium battery is 3.8V or more, the charging voltage is 4.35V. In the following, the GB/T10287 2000 specification is used as a standard and a 3.7V,1000mAh battery is taken as an example to illustrate the correct charging method of a lithium battery.


Lithium battery charging is divided into two phases:

First, constant current charging, that is a certain current, while the lithium battery voltage gradually increases with the charging process, in accordance with the above specifications are generally charged with a current of 0.2C (C is a representation of the battery nominal capacity and current control, 0.2C That is 200mA), when the battery voltage is close to full voltage 4.2V, constant current charging is changed to constant voltage charging. This process is about five hours.

Second, constant voltage charging, that is, a certain voltage, and the current with the battery's saturation degree gradually reduced, according to the specification, when the current is reduced to 0.01C or 10mA, the charge is considered to terminate. After this process and constant current charging time are added, the total charging time should not exceed eight hours. Therefore, there are two criteria to determine whether the lithium battery has reached saturation: First, the current is 0.01C, and the second is that the total duration does not exceed eight hours. In other words, if the lithium battery charging process cannot reach 0.01C after eight hours, then Considered as a non-conforming product. At this point, we have a theoretical understanding of how to charge a lithium battery. When a user charges a lithium battery, he only needs to follow the instructions on the regular charger manual, because the regular lithium battery charger is based on the lithium battery. Characteristics of the design of a good charging mode, including the constant current and constant voltage charging process, we only need to determine the battery is full according to the indicator light of the charger. If the charger is abnormal, we can use 8 hours as the basis (prerequisite is that your charger is 0.1C).

At present, the relatively mature technology of lithium battery manufacturers, high-quality lithium batteries will be added to the battery protection board, comes with overcharge and over discharge protection, overcharge protection voltage and over discharge protection voltage according to the actual requirements of the battery to determine.

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